Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 10 of 10 for “"Q Cycle"”.
-
Kinetic studies of mechanism of ubiquinol:cytochrome c(2) oxidoreductase of Rhodobacter sphaeroides: A steady state approach
… uncoupled system and defined by the modified Q-cycle model. (2d) The electrogenic step between two b-cytochromes accounts for 65%-70% of the total electric span across the membrane. (3) A complete dynamic thermodynamic profile has been established for the electron transfer chain as it approaches …
-
Theoretical study of the cytochrome bc1 complex reaction mechanism
… biochemical function relies on the so-called Q- cycle, which is well established and operates via quinol substrates that bind the protein at their active sites. Despite decades of research, the quinol-protein interaction that initiates the Q-cycle has not yet been completely described. …
-
Protein Coevolution and Coadaptation in the Vertebrate bc1 Complex
… the enzymatic reaction known as the modified Q-cycle. In the Q-cycle the bc1 complex transports protons from the matrix to the intermembrane space of the mitochondria, creating the proton gradient used to make ATP. The energy to move these protons is obtained by shuttling electrons from the …
-
Identifying the mechanism of second proton release from the bc1 complex Qo-site
… accepted to operate according to a modified Q-cycle, but there is still debate over some aspects of the mechanism. We used the pH-sensitive dye neutral red to study the release of protons from the bc1 complex, with specific focus of the mechanism for release of the second proton from the …
-
Parallel instrumentational approaches to the study of the bioenergetics of photosynthesis in chloroplasts and intact plants
… of these studies were in agreement with a Q-cycle mechanism for the cytochrome $b\sb6/f$ complex. The field-portable version of the spectrophotometer demonstrated by observation of the electron transfer kinetics through cytochrome $b$ and $f$ and by observing the flash-induced electrochromic …
-
Structure-based theoretical characterisation of the redox-dependent titration behaviour of cytochrome bc1
… and proton translocation is based on the Q-cycle mechanism. This mechanism comprises two CoQ-binding active sites, that catalyse the oxidation/deprotonation and reduction/protonation of CoQ, respectively. The two sites are located at opposite sides of the membrane. Their intricate chemistry …
-
Qo site of the bc1 complex; unlocking the gate of the electron transport chain
The bc1 complex of the electron transport chain is critical to production of ATP through the proton gradient driven by quinone oxidation; a ubiquitous mechanism for energy conversion throughout the biosphere. In addition to being a central source of energy transduction, its bypass reactions can …
-
Structural and biochemical studies on enzymes involved in natural product biosynthesis and cellular respiration
… binding site, which is critical for the q cycle in the electron transport chain of bacteria.
-
Exploring the Function of Cytochrome c6A
… b6f complex in response to light, while the Q cycle appeared functional. In DISCO Light, the c6A-dependent phenotype of an altered light harvesting balance was amplified, the photochemical activity of PSII was lower without c6A, and elevated NPQ levels suggested increased stress levels in the …
-
Electron gating and mechanism of proton exit in quinol oxidation in cyt bc1 complex from R. sphaeroides
The cytochrome bc1 complex of Rhodobacter sphaeroides in wild-type and several strains mutated at the conserved -PEWY- glutamate residue (E272 in chicken, E295 in R. sphaeoroides) were characterized in situ to determine the functional role of this residue in the second electron transfer of quinol …